Add cargo directive to rebuild the auto-generated tests when files under org_mode_samples get updated.

build.rs

@@ -16,6 +16,9 @@ fn main() {
     let destination = Path::new(&out_dir).join("tests.rs");
     let mut test_file = File::create(&destination).unwrap();
 
+    // Re-generate the tests if any org-mode files change
+    println!("cargo:rerun-if-changed=org_mode_samples");
+
     write_header(&mut test_file);
 
     let test_files = WalkDir::new("org_mode_samples")

org_mode_samples/greater_element/plain_list/alphabetical_bullets.org

@@ -0,0 +1,3 @@
+# These are only allowed by configuring org-list-allow-alphabetical which the automated tests are not currently set up to do, so this will parse as a paragraph:
+a. foo
+b. bar